نتایج جستجو برای Lot-sizing

تعداد نتایج: 36729  

Journal: :Computers & OR 2008
Silvio A. de Araujo, Marcos N. Arenales, Alistair R. Clark,

A lot sizing and scheduling problem prevalent in small market-driven foundries is studied. There are two related decision levels: (1) the furnace scheduling of metal alloy production, and (2) moulding machine planning which specifies the type and size of production lots.Amixed integer programming (MIP) formulation of the problem is proposed, but is impractical to solve in reasonable computing t...

2010
Carina Pimentel, Filipe Alvelos,

The intent of this extended abstract is to briefly describe the work developed by the PhD student Carina Pimentel during her PhD studies, since 2007 until now. The core subject of this work is the development of models and methods for solving medium/short term production planning problems. Two different problems are studied. The first one is a classical lot sizing problem. For this problem seve...

Journal: :Math. Program. 2006
Laurence A. Wolsey,

We study two different lot-sizing problems with time windows that have been proposed recently. For the case of production time windows, in which each client specific order must be produced within a given time interval, we derive tight extended formulations for both the constant capacity and uncapacitated problems with Wagner-Whitin (non-speculative) costs. For the variant with nonspecific order...

Journal: :J. Inf. Sci. Eng. 2007
Jing-Shing Yao, Wen-Tao Huang, Tien-Tsai Huang,

In terms of flexibility and product variety in lot-sizing systems of crisp cases, the average demand of per unit of time (mj), the relative duration of setup (qj), and the unit cost of production (cj) are considered. Instead of using the usual method that the mj, qj, and cj in the total cost function are respectively fuzzified by the triangular fuzzy numbers to derive fuzzy total cost, in this ...

2016
Mohsen Basti, Maghsoud Amiri,

The integration of sequencing decisions in lot-sizing and scheduling problems has received an increased attention from the research community due to its inherent applicability to the real-world problems. In this paper, we develop and solve a synchronized and integrated two-level lot-sizing and scheduling problem motivated by a real-world problem arisen in the soft drink production. The soft dri...

Journal: :Oper. Res. Lett. 2011
Michael R. Wagner,

We study inventorymanagement problemswhere demands are revealed incrementally and procurement decisionsmust bemade before the demands are realized. There are no probabilistic distributions nor nontrivial bounds to characterize demands. We consider two cost minimization problems: (1) perishable products with lost sales and (2) durable products with backlogged demand. In both problems, costs are ...

2010
M. Ziaee, J. L. Bouquard,

Article history: Received 1 January 2010 Received in revised form 10 March 2010 Accepted 1 April 2010 Available online 30 April 2010 Vendor Managed Inventory (VMI) is one of the effective techniques for managing the inventory in supply chain. VMI models have been proven to reduce the cost of inventory compared with traditional economic order quantity method under some conditions such as constan...

1991
Stan van Hoesel, Albert Wagelmans, Antoon Kolen,

A linear description for the economic lot-sizing problem consisting of exponentially many linear inequalities was given by Barany, Van Roy and Wolsey in 1984. Using this formulation we present a dual algorithm for the economic lot-sizing problem, which is of the same complexity as the Wagner and Whitin dynamic programming algorithm. Besides its use in sensitivity analysis the dual algorithm als...

2015
D. N. P. MURTHY,

The classical lot, sizing model deals with economic lot sizing for production in a deterministic framework. In real life, various forms of uncertainty affect the production. These include machine breakdown, quality variations, and so on. This paper develops a model with unreliable production systems and under alternative repair option strategies. @ 2000 Elsevier Science Ltd. All rights reserved...

Journal: :European Journal of Operational Research 2008
Mohamed Ben-Daya, M. Darwish, K. Ertogral,

With the growing focus on supply chain management, firms realize that inventories across the entire supply chain can be more efficiently managed through greater cooperation and better coordination. This paper presents a comprehensive and up-to-date review of the joint economic lot sizing problem (JELP) and also provides some extensions of this important problem. In particular, a detailed mathem...

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